Excitonic luminescence of iodine-intercalated HfS2

• Published in: Applied physics letters Vol. 122; no. 4
• Main Authors: Zawadzka, N., Woźniak, T., Strawski, M., Antoniazzi, I., Grzeszczyk, M., Olkowska-Pucko, K., Muhammad, Z., Ibanez, J., Zhao, W., Jadczak, J., Stępniewski, R., Babiński, A., Molas, M. R.
• Format: Journal Article
• Language: English
• Published: Melville American Institute of Physics 23-01-2023
• Subjects: Applied physics; Correlation analysis; Crystal growth; Emission analysis; Excitons; Hafnium compounds; Iodine; Low temperature; Photoluminescence; Secondary ion mass spectroscopy
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/5.0126894

Photoluminescence from bulk HfS2 grown by the chemical vapor transport method is reported. A series of emission lines is apparent at low temperature in the energy range of 1.4–1.5 eV. Two groups of the observed excitonic transitions followed by their replicas involving acoustic and optical phonons are distinguished using classical intensity correlation analysis. The emission is attributed to the recombination of excitons bound to iodine (I2) molecules intercalated between layers of HfS2. The I2 molecules are introduced to the crystal during the growth as halogen transport agents in the growth process. Their presence in the crystal is confirmed by secondary ion mass spectroscopy.